The fire is just the way my Cosmos manifests, it's harmless for those who lack evil intent or spirit.

[Which... Can be the case of this man at this moment apparently. He's sure he felt something else in him before he entered the flames fully but it was too brief to be sure and he won't question about it for now.]

The armor is called a Cloth, and it's proof of my position as the Phoenix Saint back in my world.